TY  - BOOK
AU  - 
TI  - Studies on the freshwater plankton of Puerto Rico
PY  - 1973///
CY  - Ann Arbor, Mich.
PB  - University Microfilms
KW  - Limnology
KW  - Local
KW  - Lakes
KW  - Puerto Rico
KW  - Biological research
KW  - Plankton
N1  - "Authorized facsimile of the author thesis submitted to the Graduate Faculty of the University of Minnesota; Includes bibliographical references
ER  -